The current-insulating bearings include all rolling bearings that give insulation against current passage.Coated bearings, in which either the inner ring or outer ring has a ceramic coating, are current-insulated bearings. The ceramic layer gives insulation against current passage.Hybrid bearings in which the rolling elements are made from ceramic also have a current-insulating effect. In this case, the rolling elements prevent current passage.In general, it is difficult to eliminate the causes of electrical voltage in the rolling bearing. Nevertheless, bearing damage can be prevented if it is possible to stop or significantly reduce the flow of current. Current-insulating rolling bearings of numerous designs are now available for this purpose. The components that should be insulated are dependent on the type of voltages occurring.